JRaceman can check the data in the database for correctness and consistency. The commands in the Checks tab perform these checks. You should run these checks occasionally to make sure there are not errors in your data which could lead to problems or confusion later.
Each Check command displays the errors it finds in the Results tab. If you find an error in your data using a Check command, it is usually possible to double-click on a row in the Results tab and be taken directly to the editing form for that data. In some cases you may be able to look at the data to understand the cause of the error being reported, then use the tab of your choice to correct the error. If the data can not be corrected using one of the standard tabs, you can always edit the data using debugging mode.